Xanthone-ddt insecticide



Patented Aug. 31, 1948 w i UNITED STATES PAT NT OFFICE XANTHONE -DDT INSEUI'ICIDE James F. Adams, Wilmington, Del., assignor to Allied Chemical & Dye Corporation, corporation of New York No Drawing. Application June 23, 1945, i

' Serial No. 601,319

8 Claims. (Cl. 167-30) 1 2 This invention relates to a new insecticide for spray supplements such as sticking, spreading, application to perm, stone and nut fruit trees for wetting and flocculating agents. control of insects such as the codling moth larvae, The following field tests conducted in a. comoriental peach moth larvae and mites such as mercial apple orchard illustrate the effectiveness European red mite, which infest such trees. of my compositions in comparison with DDT and In accordance with this invention control of xanthone alone. The portion of the orchard insects infesting pome, stone and nut fruit trees selected for testing was divided into three blocks, is effected by applying to the trees arnixture conthe trees in each block bearing apples of the taining 2,2-bis (parachlorophenyl)-1,1,1-trichlo- Delicious variety. The trees of each block were methane and xanthone. I have found that mixgiven a standard schedule of pre-blossom sprays tures of xanthone and 2,2-bis (parachlorophenyD- followed by four standard cover sprays of lead 1,1,1-trichloroethane are highly toxic to insects arsenate. Starting with the fifth cover spray the such as codling moth larvae and that the percent trees were sprayed with the compositions dekill obtained upon the use of these mixtures is scribed below, a total of six applications of 20 greater than that which is obtained by the use gallons per application per tree being made before of individual ingredients of the mixture, the in- Y harvest; the composition of the sprays is given crease in toxicity possibly bein attributable to in terms of the amount of active ingredient per synergistic action between the individual ingre- 100 gallons of spray; in the last three sprays for dients of the mixture; I have further found that each block a quart of (summer oil" (a highly sat the mixture employed in accordance with my urated hydrocarbon oil) was included to prevent invention possesses the distinct advantage that defoliation. The results of the tests are expressed it not only achieves a highly effective control of in terms of the number of stings or worms per 100 insects such as codling moth larvae which infest apples picked and dropped; a stung apple is one pome, stone and nut fruit trees, but also prevents bearing one or more of the shallow injuries made damage to the trees due to the presence of mites by a codling moth larva killed while eating into such as the European red mite, two spotted mite, the apple; a "wormy apple is one bearing one Pacific mite, red spider and Bryobia mite; this or more of the deep injuries made by a codling latter advantage is of importance since the mite moth larva which successfully eats into the flesh population tends to increase markedly when of the apple; a "clean apple is one bearing no 2,2-bis (parachlorophenyl) -1,1,1-trichloroethane 30 injury.

alone is employed for control of insects such as Summary of tests the codling moth larvae which infest pome, stone and nut fruit trees. Accordingly it will be evident Percent Drops and that the mixture of my invention possesses im- Com 05mm Picks Mite Prov- Block alence portant advantages for control of insects infestpray ing pome, stone and nut fruit trees. Stings Worms Clean The compound 2,2-bis' (parachlorophenyl-1,1,1- trichloroethane is known throughout the art as 1%lbs. a e- 20- as 82 Trace. DDT and hereinafter it will be referred to as such. 83:: fig; 331, 3; 3g gfggg- V Theproducts of my invention may be formed lb. DDT. by admixing DDT with xanthone in proportions such that the resulting mixture contains between In block 3 the heavy mite prevalence was of about 10 andabout 100 parts of DDT for every the order of 200 to 300 mites per leaf, suflicient to 100 Parts Xanthonemixture may cause conspicuous bronzing of the foliage.

be applied to the trees. any Suitable manner' From the above tests it will be seen that the Thus the DDT'XaHth-One mixture may 9 mixture of xanthone and DDT gives more effecblned with a dust carrier Such as an inert tive control of codling moth larvae than xanthone dered y and the dust applied to the treesor DDT alone, the percent clean applies being Preferably, however, the DDT-xanthone mixture greater than obtained using xanthone isldispersed in an aqueous medium so as to form so alone and 9.5% greater than when using DDT a dispersion containing between about /2 and 1 I about 2 lbs. of xanthone and between about /4 since certain changes may be made in the comand about 1 lb. of DDT per 100 gallons of disperpositions of my invention without departing from sion and the dispersion then sprayed upon the the scope thereof. it is intended that all matter trees; such dispersions may contain conventional contained in the above description shall be interreted sis illustrative and not in a limiting sense.

Iclaim:

1. An insecticidal composition, the essential active ingredients of which are 2,2-bis(parachlorophenyl)-1,l,1-trichloroethane and xanthone.

2. An insecticidal composition, the essential active ingredients of which are 2,2-bis(parachlorophenyl)-1,1,l-trichloroethane and xanthone, the composition containing between about and about 100 parts by weight of 2,2-bis(parachlorophenyl)-l,1,1-trichloroethane per 100 parts by weight of xanthone.

3. An insecticidal composition comprising an aqueous dispersion. the essential active ingredients 01' which are 2,2-bis(parachlorophenyl)- 1,1'.1-trlchloroethane and xanthone.

4. An insecticidal composition comprising an aqueous dispersion containing, as its essential active ingredients, between about A and about 1 lb. of 2,2-bis(parachlorophenyl)-1,1,1-trlchloroethane and between about V2 and about 2 lbs. of xanthone per 100 gallons of dispersion.

5. A method for controlling insectsinfesting pome, stone and nut fruit trees, which comprises subjecting the insects to the action of a mixture containing as its essential active ingredients 2,2-

which comprises spraying the tree with an aque-.

ous dispersion containing as its essential active ingredients between about /4 and about 1 lb. oi 2,2-bis(parachlorophenyl)-l,1,1 trichloroethane and between about and about 2 lbs. 01' Iranthone per gallons of dispersion.

- JAMES F. ADAMS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 22,700 Muller Dec. 4, 1945 2,347,377 Swaine Apr. 25,. 1944 OTHER REFERENCES Campbell et al., Manufacturing Chemist and Manufacturing Pertumer, Sept. 1944, vol. XV,

No. 9, pages 312, 315, 316.

Ingram, J Economic Entomology, February 1944. V0]. 37, NO. 1, pages 144, 145. 

